Stilson wrench.



F. J. DOWLE.

STILSON WRENCH. APPFICATION FILED SEPT. 28, IBIS Patented J uly 3, 1917.

nurrun sas rarnur oration.

FREDERICK J. DOVVLE, 0F TREN'ION, NOVA SCOTIA, CANADA, ASSIGNOR OF ONE-HALF TO EDMOND HAZEN HENDERSON, OF PARRSBORO, NOVA SCOTIA, CANADA.

STILSON WRENCH.

Specification of Letters Patent.

Patented July 3, rear.

Application filed September 28, 1916. Serial No. 122,759.

To all whom it may concern:

Be it known that I, FREDERICK J. Downs, a British subject, residing at the town of Trenton, in the county of Pictou, in the Province of Nova Scotia, Dominion of Canada, have invented new and useful Improvements in Stilson "Wrenches, of which the following is a specification.

- My invention relates to improvements in Stilson wrenches which. are used chiefly for" -illustrated in the accompanying drawing in which- Figure 1 is aside View of the machine. Fig. 2 is an edge view of Fig. l. The light broken lines show the supplementary jaw, the guide sleeve and the handle as they appear in operation.

Similar letters refer to similar parts throughout the several views.

In the drawing 5 is the adjustable jaw the stem of which is oblong in cross section and is partially threaded, the enlarged part being serrated to prevent slipping when in operation; 0 is the cage which holds in position the nut f which is threaded to match the adjustable jaw b which passes through the cage 0 and is adjustable therein by means of the nut I. (Z is the guide sleeve which is movable on the stem of the adjustable jaw Z). a is the handle through which the power is applied. At the pivoted end it is of an even thickness of the stem of the adjustable jaw b and is pivoted in the cage 0 at w. e is the supplementary jaw, the grasping part of which is serrated and is the same in thickness as the cage 0 and the guide sleeve all, into which sleeve it is fitted and pivoted at n. It is also fitted against the cage 0 and clasps the thin part of the handle a and is pivoted to it at h. The parts 0, e

and d when held in place by the spring 9 tion of the spring 9 is to quickly release the grasp of the jaws when the pressure is removed, and to throw the handle back to its original position.

When the wrench is being operated the handle, the supplementary jaw, and the gulde sleeve are carried in the direction indicated by the light broken lines, showing that any increase of power applied results in increased grasping pressure on the jaws.

Having illustrated and described my invention what I claim and desire to secure by patent is:

1. In a wrench, the combination of a cage, a jaw having a partially threaded shank integral therewith passing through and carried by said cage, a nut carried by said cage adapted to engage and adjust said shank and jaw, a lever hinged to said cage, a supplementary jaw pivotally attached to said lever and movable thereby, and a guide slidable on said partially threaded j aw, pivotallyattached to said supplementary jaw and adapted to support the free end of the same; substantially as described.

2. In a wrench the combination of a cage, a jaw adapted to hold on round surfaces having a partially threaded shank integral therewith passing through and carried by said cage, a nut carried by said cage adapted to engage and adjust said shank and jaw, a lever hinged to said cage, a supplementary jaw adapted to hold on round surfaces-piv otally attached to said lever and movable thereby, and a guide sleeve slidable on saidpartially threaded shank pivotally attached to said supplementary jaw and adapted to support the free end of the same; substan-. tially as set forth.

3. In a wrench the combination of a jaw adapted to hold on round surfaces having a partially threaded shank integral therewith, a cage adapted to carry and guide said shank and jaw, a nut carried by sa d cage adapted to engage and adjust said shank and jaw, a lever hinged to said cage, a supplementary jaw adapted to hold on round present an even jointed surface. The funcsurfaces pivotally attached to said lever and position; all substantially as described and i'nm al blg1 thereilpmfa guide? slteeve dpivotallly for the purpose specified. attac 1e to t e ree en 0" sai supp ementary jaw movable on said partially FRED DOWLE' 5 threaded shank, With a plate spring attached Witnesses:

to said supplementary jaw and tending to Jnssm M. MACMILLAN, maintain said lever and shank in a parallel H. K- FITZPATRICK. 

